>>3620900This thing is a technical marvel even today. Also bitches love it. Both the Tessar and Sonnar versions are great as far as optics go. Cons include scale focusing only, hot shoe mounted on the bottom plate, the light meter requires mercury batteries or a workaround, and the batteries can't be changed without opening the film compartment. The light meter is also often busted, but as a fully mechanical camera this doesn't prevent operation and can reduce the price significantly.
Pic related, taken with the 3.5/40 Tessar version.